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is a significant concern for physicians. Central* [4 w% z* e& M! G0 W
precocious puberty (CPP), which is mediated
( x8 i7 [: @, g- X6 lthrough the hypothalamic pituitary gonadal axis, has7 e6 }& f2 [6 y, u P. O
a higher incidence of organic central nervous system6 c o2 Z6 K2 i& G6 ?9 t# ?9 O. g
lesions in boys.1,2 Virilization in boys, as manifested4 `1 r- P0 R/ d
by enlargement of the penis, development of pubic
( f! I( @5 K; P, a. ?hair, and facial acne without enlargement of testi-
' L: Q" l1 `2 s$ ^7 {/ O$ S' lcles, suggests peripheral or pseudopuberty.1-3 We
. j0 ]7 i6 D w9 t' preport a 16-month-old boy who presented with the
7 G% z2 J& b* W9 T/ f" {) P senlargement of the phallus and pubic hair develop-
7 P1 G8 q# j l' }ment without testicular enlargement, which was due0 j r. ]+ G, V* Y. o
to the unintentional exposure to androgen gel used by8 U8 u: V9 G( D$ P0 O8 @
the father. The family initially concealed this infor-$ e3 Y9 V L- C, g& ^# i( c- d
mation, resulting in an extensive work-up for this6 \0 f, C4 `0 b9 K( J1 Q
child. Given the widespread and easy availability of& m! s% A' n% @$ k2 X; j1 h' h! o/ O
testosterone gel and cream, we believe this is proba-3 h. ^) R) b' N2 r& o) {/ K
bly more common than the rare case report in the8 D2 l2 r# i/ Q# H
literature.4
# @. A, O' C6 b I5 L2 APatient Report
j# M# r( I, dA 16-month-old white child was referred to the8 D8 H8 ?1 v/ C# N, r( D; Y5 P7 w
endocrine clinic by his pediatrician with the concern
: { P. i/ w8 _4 A ]. oof early sexual development. His mother noticed: U: h& P2 C0 H( B- S8 t0 b( T
light colored pubic hair development when he was. X; B. W* [: V W w( O
From the 1Division of Pediatric Endocrinology, 2University of& T, q5 f, a% d3 U% ]3 S4 y
South Alabama Medical Center, Mobile, Alabama.
- s' j: X1 P: c& q) e; o0 @6 HAddress correspondence to: Samar K. Bhowmick, MD, FACE,1 F3 c, l& o' c; d3 ?
Professor of Pediatrics, University of South Alabama, College of) |3 f+ ^( D W8 m% n2 G! `% l
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;' f$ `! c9 {, [3 S4 x S9 C( D! s5 }
e-mail: [email protected].
1 ? q1 O4 u3 I2 V9 xabout 6 to 7 months old, which progressively became- n( |9 Q2 o: R1 z* z' X
darker. She was also concerned about the enlarge-! c/ S5 X1 u# u7 t+ Q
ment of his penis and frequent erections. The child. V& j% u, L2 G/ {4 M8 n6 R
was the product of a full-term normal delivery, with
" K2 c; p# J! B( g( \" ~a birth weight of 7 lb 14 oz, and birth length of
9 f% b6 N$ y6 d7 J1 W20 inches. He was breast-fed throughout the first year
7 s4 P. b+ B# I# P, bof life and was still receiving breast milk along with* ~( ^; b, M; n# c+ g7 u, D& q
solid food. He had no hospitalizations or surgery,2 B [, {: m4 ^' S
and his psychosocial and psychomotor development
5 B: K8 {6 j4 [2 Rwas age appropriate.
) o$ ~- I, U7 ]3 A( {The family history was remarkable for the father,
' z8 _. Z% P) m0 Xwho was diagnosed with hypothyroidism at age 16,
1 O B5 n; S/ g7 O1 E8 J# Hwhich was treated with thyroxine. The father’s+ X, b, y0 K9 D3 V: C2 j
height was 6 feet, and he went through a somewhat* H2 c4 e$ J3 T+ q) [
early puberty and had stopped growing by age 14.& D- q8 M4 x( c$ A
The father denied taking any other medication. The6 }: u$ [. j% h" t' ]
child’s mother was in good health. Her menarche
5 }# I( R6 G { F0 y7 O' ~was at 11 years of age, and her height was at 5 feet- [& G& ^9 d0 k8 K3 U0 {
5 inches. There was no other family history of pre-# ~5 z# S( h% \8 a6 G" y( C2 K6 [4 G
cocious sexual development in the first-degree rela-
% H6 X+ Z) N4 C4 ptives. There were no siblings.
' Z0 g+ m- D" l/ G1 |( P; t FPhysical Examination
3 L9 ?# z; Y' e3 N& lThe physical examination revealed a very active,
c- P& S3 p5 S9 [" Lplayful, and healthy boy. The vital signs documented- h) k. \7 C2 L$ @
a blood pressure of 85/50 mm Hg, his length was/ M7 g' }6 M; R9 m
90 cm (>97th percentile), and his weight was 14.4 kg
9 c, M. Z |1 l2 F! n(also >97th percentile). The observed yearly growth
+ p, O* b7 w. E8 Y6 \9 l% bvelocity was 30 cm (12 inches). The examination of9 i r" Y! g' P4 ~1 K
the neck revealed no thyroid enlargement.
4 n$ l* S9 G- R" ^: i. n+ M/ `The genitourinary examination was remarkable for( m+ L- P" N3 ^; |# S% C' v
enlargement of the penis, with a stretched length of, E% i/ V! U7 U# z# o1 k* T
8 cm and a width of 2 cm. The glans penis was very well
! q# N: T2 `6 l" wdeveloped. The pubic hair was Tanner II, mostly around: Y2 C/ X& y5 w3 X( r* g
540
% ]; h. ^8 B+ F. @at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
~ _( b' q: Vthe base of the phallus and was dark and curled. The
1 Q7 T8 L6 q+ f% t% `$ x! utesticular volume was prepubertal at 2 mL each.3 [/ }+ @ y6 x& y/ q
The skin was moist and smooth and somewhat/ R: b2 B: H' v3 T
oily. No axillary hair was noted. There were no+ D" p7 Q4 q0 s- c- e' c( D0 h
abnormal skin pigmentations or café-au-lait spots.
; j/ u: Q0 {; ENeurologic evaluation showed deep tendon reflex 2+1 b' ?$ d- X) B% d( g" o4 |5 u
bilateral and symmetrical. There was no suggestion/ o2 b7 o# i* W* E) a+ w m7 o7 L& V5 v* [
of papilledema.
( e/ v# z1 ~3 _2 @" Q' s5 B0 I/ zLaboratory Evaluation
+ R( j) X( A1 r, R# zThe bone age was consistent with 28 months by
2 e4 G9 x0 a( _' [4 [using the standard of Greulich and Pyle at a chrono-
( D+ q& K, `5 @# f' }logic age of 16 months (advanced).5 Chromosomal3 D9 i7 s4 S% ]' \% \" f V: g
karyotype was 46XY. The thyroid function test
9 B* `; M! X, |4 d2 Pshowed a free T4 of 1.69 ng/dL, and thyroid stimu-& k9 h3 P; Y5 `; ^6 I) S
lating hormone level was 1.3 µIU/mL (both normal).
7 V L* v0 `7 J T1 h/ @4 n) a$ QThe concentrations of serum electrolytes, blood
$ N/ [: M) t; Zurea nitrogen, creatinine, and calcium all were9 `+ K. @4 @! k* D% y- l- g
within normal range for his age. The concentration
5 C7 N4 g5 [$ n7 q0 A! x% Jof serum 17-hydroxyprogesterone was 16 ng/dL9 J0 E4 [+ _5 m
(normal, 3 to 90 ng/dL), androstenedione was 20. W- C2 c/ Y2 e
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-9 l8 X. t4 Q& \
terone was 38 ng/dL (normal, 50 to 760 ng/dL),# E% p' \ E# D. @" m* M* B# L/ b
desoxycorticosterone was 4.3 ng/dL (normal, 7 to
, g! Q+ a: i9 r' k: m% \2 b49ng/dL), 11-desoxycortisol (specific compound S)& x3 t3 k& R( I' E' g. Z6 [
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
4 g) q$ F" p: Q! t" l0 ?tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
8 F2 E1 _, n r# Ctestosterone was 60 ng/dL (normal <3 to 10 ng/dL),( S) i2 g% c8 x: {8 ], T" X
and β-human chorionic gonadotropin was less than( _% H: n0 D7 U& Q, d, W! E/ W) q
5 mIU/mL (normal <5 mIU/mL). Serum follicular
% s6 \& E; O3 |stimulating hormone and leuteinizing hormone! N' t. k2 M9 h! J) p) ?! G
concentrations were less than 0.05 mIU/mL" V5 t5 j- ^. x' K; n
(prepubertal).
6 ]5 j! H/ M9 K: o9 i/ H5 _The parents were notified about the laboratory( Q2 r8 D, Y& o. q
results and were informed that all of the tests were
1 |; E$ T+ f. i) q0 r( Unormal except the testosterone level was high. The2 K0 J+ n! p7 v% z! T$ R
follow-up visit was arranged within a few weeks to6 T% O& o2 G5 L+ P
obtain testicular and abdominal sonograms; how-
) [& k' P2 N- ]ever, the family did not return for 4 months.1 @5 \" N5 J& s6 D7 |( T
Physical examination at this time revealed that the9 s% q7 }1 {* W, |
child had grown 2.5 cm in 4 months and had gained* T% y% j8 c. \3 g
2 kg of weight. Physical examination remained( ?! ?# [% \" O; J) f c% M K
unchanged. Surprisingly, the pubic hair almost com-* b+ V% u' m2 M) A( V+ e- _( `
pletely disappeared except for a few vellous hairs at% F* h+ h4 O$ ?! o
the base of the phallus. Testicular volume was still 25 z! m1 {7 O: g o
mL, and the size of the penis remained unchanged.
/ ], @6 Q! a ^7 W# } Y# jThe mother also said that the boy was no longer hav-
`7 V) y! o, S' S* king frequent erections.
+ Q7 l0 r) y, u: J8 x y- F5 QBoth parents were again questioned about use of
! \$ |; N3 {' S3 Wany ointment/creams that they may have applied to0 z# S0 z8 w$ i1 d! v. H9 H
the child’s skin. This time the father admitted the' W. Y' C/ _# _& x. W/ T
Topical Testosterone Exposure / Bhowmick et al 541- c& c8 r: D+ t; w- b
use of testosterone gel twice daily that he was apply-
1 f. @$ y5 D$ _) d4 ning over his own shoulders, chest, and back area for
* t5 k4 o" I/ c; J- Va year. The father also revealed he was embarrassed
. t& ~4 d( Y% q( _/ K, g) Lto disclose that he was using a testosterone gel pre-
9 U# C( S5 y) h: Hscribed by his family physician for decreased libido5 P6 n$ u) v' u6 P: }
secondary to depression.) ]7 d( D0 \; s& \2 c' W
The child slept in the same bed with parents.
/ X- I: D, z5 wThe father would hug the baby and hold him on his) _1 p" A/ }8 r7 U& e/ J4 b. H5 B
chest for a considerable period of time, causing sig-% J9 j! A1 i+ s7 j- ^5 J; s
nificant bare skin contact between baby and father.
% J; U3 X+ o* o9 W, _% HThe father also admitted that after the phone call,
" N' {/ `: X( n% v; g( D0 _+ _; B7 s4 \/ hwhen he learned the testosterone level in the baby
2 a2 [ |* R8 c% |was high, he then read the product information% z6 h( D% Y& @) [8 B1 q5 }
packet and concluded that it was most likely the rea-7 t/ D/ _/ G( |( f" e
son for the child’s virilization. At that time, they5 a, x# d4 J. z! }7 W
decided to put the baby in a separate bed, and the: k6 P0 ?/ S5 @& [4 k8 O) G
father was not hugging him with bare skin and had* C7 d$ J8 ]4 M
been using protective clothing. A repeat testosterone
& W u v& ]; x4 P( r0 c$ Ytest was ordered, but the family did not go to the
[7 m! _8 g8 R! X! \laboratory to obtain the test.9 ?$ \2 z& y; u
Discussion/ [6 |/ T9 F$ J9 A! F% e
Precocious puberty in boys is defined as secondary1 v9 N" V6 `: V' f4 k) b" v5 @1 H
sexual development before 9 years of age.1,4( g; w! X/ R2 Q/ i
Precocious puberty is termed as central (true) when
$ Q. C0 t0 n( c% h& vit is caused by the premature activation of hypo-) C5 v0 Y: H- j) V1 w
thalamic pituitary gonadal axis. CPP is more com-+ o) r4 ?4 H# L, X V6 R2 f Q
mon in girls than in boys.1,3 Most boys with CPP
, c' v0 ]* o" V5 K V3 ?1 `may have a central nervous system lesion that is5 S, Y' T1 G' e
responsible for the early activation of the hypothal-, M) C; y4 i) a- f$ Q. }
amic pituitary gonadal axis.1-3 Thus, greater empha-
$ E* `* h: G" y( I/ o2 a/ bsis has been given to neuroradiologic imaging in
- ~5 L, k/ F. u- qboys with precocious puberty. In addition to viril-
6 S6 q! [' G. P: `2 w1 \. gization, the clinical hallmark of CPP is the symmet-# U- J0 A9 i9 S3 c
rical testicular growth secondary to stimulation by
) J* D3 t6 q% o- X7 N/ Z' b, pgonadotropins.1,31 F6 ^' D) J! K+ ~5 @4 o
Gonadotropin-independent peripheral preco-
; P* N* E. e! D, ccious puberty in boys also results from inappropriate7 J$ F- x% }1 d. W: H) Z% e
androgenic stimulation from either endogenous or
1 J; r# W8 x" y& u3 F" L, wexogenous sources, nonpituitary gonadotropin stim-
& g& h" y; \8 v" hulation, and rare activating mutations.3 Virilizing3 U2 I+ x) a$ |% y2 H6 D V
congenital adrenal hyperplasia producing excessive
* @9 H4 H6 I& j3 Q7 }; B4 |1 fadrenal androgens is a common cause of precocious% n% l% a. e: J, T# c6 Q
puberty in boys.3,4( u- m0 L9 I* M4 ~
The most common form of congenital adrenal
1 V; {; I0 u) l6 L! X# B U1 ~hyperplasia is the 21-hydroxylase enzyme deficiency.$ i. i- q$ W3 F+ U' a4 W( D) I
The 11-β hydroxylase deficiency may also result in7 _* A: v4 P/ ~* r! e, j
excessive adrenal androgen production, and rarely,- |3 y; U, Z8 P* E; Y
an adrenal tumor may also cause adrenal androgen7 p/ s2 ? d, ]; T/ j, D: L
excess.1,3
( b0 A C7 K6 }5 D0 M$ Oat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from! S8 y) P7 ?7 w, G+ w! v$ W' |) C
542 Clinical Pediatrics / Vol. 46, No. 6, July 20079 c7 X0 L$ H7 B7 j1 K
A unique entity of male-limited gonadotropin-
) y i8 R# g9 W! ]independent precocious puberty, which is also known
' j. L$ b& e5 |8 Q3 L! m1 J- Sas testotoxicosis, may cause precocious puberty at a4 \& ~" L% \, ~% m* P4 m* a5 U# J8 s
very young age. The physical findings in these boys" x5 o$ J- M5 ~- U7 k2 x- |7 {2 @
with this disorder are full pubertal development,# e$ d) u9 @5 U
including bilateral testicular growth, similar to boys* a e. W# i* Z, z
with CPP. The gonadotropin levels in this disorder
8 f& F2 E5 t9 G1 N ^8 ?are suppressed to prepubertal levels and do not show
' g, Q, W6 }. k, J+ T5 u6 K7 ipubertal response of gonadotropin after gonadotropin-) ^' X% W O; U# y( s
releasing hormone stimulation. This is a sex-linked
% i3 d/ k- |6 k$ E1 ?* Q* ~autosomal dominant disorder that affects only4 o& Z' J% a3 @0 o
males; therefore, other male members of the family, {! c- @& w9 F$ e' E
may have similar precocious puberty.3
4 l8 Q4 E, p* O1 C' f# y0 s( j7 xIn our patient, physical examination was incon-: W4 B" m: _1 d" V; U4 {- z
sistent with true precocious puberty since his testi-
H0 @: B$ H$ ?% y. _; V' |cles were prepubertal in size. However, testotoxicosis
7 }$ W# P3 X! hwas in the differential diagnosis because his father
( B) j: ? n" K+ N2 kstarted puberty somewhat early, and occasionally,
+ `' f% c% K4 L8 stesticular enlargement is not that evident in the
# |' ^5 v, |9 E0 c, t+ |beginning of this process.1 In the absence of a neg-
9 ^# W6 m" c( _ative initial history of androgen exposure, our* z* @# C# a9 V7 m5 u
biggest concern was virilizing adrenal hyperplasia,
. y$ H* i" T" ?2 ] F: Seither 21-hydroxylase deficiency or 11-β hydroxylase% M$ A+ P! u& O
deficiency. Those diagnoses were excluded by find-' f6 Q! x8 L% _ n+ `
ing the normal level of adrenal steroids.. O, D/ Y+ p+ |0 a7 @' r: ]' d7 Z/ x
The diagnosis of exogenous androgens was strongly
: R( `6 Z9 I( s" n' {6 p0 f) ssuspected in a follow-up visit after 4 months because4 V5 m! Z& m3 M W8 k+ C2 B$ f+ ~7 e
the physical examination revealed the complete disap-& D7 \$ H6 w3 D9 t6 X7 Q/ O
pearance of pubic hair, normal growth velocity, and
7 \* |7 f* {+ Rdecreased erections. The father admitted using a testos-
! k& M/ ]5 v+ A3 J& N/ s2 J$ Q3 fterone gel, which he concealed at first visit. He was& ~4 O2 e7 c# e: G
using it rather frequently, twice a day. The Physicians’* H+ a% F/ i9 E
Desk Reference, or package insert of this product, gel or
: T" c) y# H7 h& qcream, cautions about dermal testosterone transfer to" I2 F( l' ~* k" O
unprotected females through direct skin exposure.7 A3 N9 c' N& m5 _5 J3 c
Serum testosterone level was found to be 2 times the) k# B$ O5 s" E& z8 \: Z
baseline value in those females who were exposed to
/ @( b) u( h* seven 15 minutes of direct skin contact with their male
& p+ J, }6 C2 ~8 G; A7 kpartners.6 However, when a shirt covered the applica-
) c6 P1 ~- V; E4 A4 ftion site, this testosterone transfer was prevented.
, a" o5 Q9 R6 w& w j' f2 o1 POur patient’s testosterone level was 60 ng/mL,3 ]! e. Y, F8 m& [# H( V
which was clearly high. Some studies suggest that7 a1 z8 G' X& p! q- `$ K2 H! T8 T9 }
dermal conversion of testosterone to dihydrotestos-
: w1 S0 h, R- t4 D# |: ?terone, which is a more potent metabolite, is more
- C! d, ~. Z9 e, u1 |" b* s3 Yactive in young children exposed to testosterone
1 Y8 t, A. n9 o! ]exogenously7; however, we did not measure a dihy-
! X, n/ v7 d2 Q$ W m: P; Rdrotestosterone level in our patient. In addition to* W$ L; G K# J+ G4 d3 J9 Q
virilization, exposure to exogenous testosterone in5 \* K9 I" Y8 [& X/ H) g
children results in an increase in growth velocity and+ p6 c. f* I, ]% M3 u4 A
advanced bone age, as seen in our patient.4 l/ G! X% K4 F/ R6 ]
The long-term effect of androgen exposure during' q. D. i) d$ P; l4 V) K
early childhood on pubertal development and final1 h: O( |/ \: e! U* Y
adult height are not fully known and always remain( b* s H& n4 A# v
a concern. Children treated with short-term testos-% S1 M* S3 v; h7 H* |: f
terone injection or topical androgen may exhibit some6 F& O/ r6 b9 Z+ C! C+ T* x9 @! q5 h$ i7 a
acceleration of the skeletal maturation; however, after5 b3 l _2 b/ m6 V; G- l
cessation of treatment, the rate of bone maturation4 T# J, n1 f7 d2 z8 o
decelerates and gradually returns to normal.8,9
$ ~' {" X5 `$ ]4 E ZThere are conflicting reports and controversy% N! o; b6 Y! ^$ y0 p6 p- y
over the effect of early androgen exposure on adult
B [/ O" B/ [' Spenile length.10,11 Some reports suggest subnormal
) t5 O0 Y7 e c }3 R. D* Zadult penile length, apparently because of downreg-- K9 G5 x$ d; b0 K" J" i3 U* L* Q
ulation of androgen receptor number.10,12 However,
: p( \% S! e( c) p7 m* _: M/ eSutherland et al13 did not find a correlation between9 g& @( t- M1 V# C: q
childhood testosterone exposure and reduced adult
+ O [3 { R% S! v: R% gpenile length in clinical studies.
6 [, @4 z" N% \! o* B; GNonetheless, we do not believe our patient is* e* v) p( `+ y4 j7 _, L$ V
going to experience any of the untoward effects from3 c8 N3 f. b* R2 }. S
testosterone exposure as mentioned earlier because+ H6 `+ L0 r* q. a
the exposure was not for a prolonged period of time.1 ]; l; s9 d( c
Although the bone age was advanced at the time of& P0 ~- u* {, {3 u5 x! Z6 i
diagnosis, the child had a normal growth velocity at% Z+ ^9 s! M# z1 k3 z( M3 p6 e
the follow-up visit. It is hoped that his final adult8 n% T' G0 X+ p! K
height will not be affected.
% G( Q5 u# Z" F+ cAlthough rarely reported, the widespread avail-9 g$ j$ D; @3 t
ability of androgen products in our society may8 l9 R$ M0 p9 v m; g$ ?
indeed cause more virilization in male or female0 [8 s x4 x* b& m" Z; N, l; Q
children than one would realize. Exposure to andro-" l) }) N4 H, R; f/ w) j/ \
gen products must be considered and specific ques-/ H( n9 M0 p8 T
tioning about the use of a testosterone product or
N* x& y2 D3 i5 n+ T1 Pgel should be asked of the family members during
( n" _, }& M4 n. u. bthe evaluation of any children who present with vir-1 _; M9 u% P1 b* S; ~' {# b& ~
ilization or peripheral precocious puberty. The diag-+ [- t* D/ |" d( H
nosis can be established by just a few tests and by+ e" V* Q0 i( r5 N# |8 I2 B
appropriate history. The inability to obtain such a
0 t1 _: n5 l0 K- m' qhistory, or failure to ask the specific questions, may
8 ^: i e3 |: presult in extensive, unnecessary, and expensive1 s0 e+ w" Y( `: `
investigation. The primary care physician should be/ |1 \( O6 n) [" L, ~0 i
aware of this fact, because most of these children
) J! f7 M- B. t4 b4 N: l( t- Ymay initially present in their practice. The Physicians’
; ^3 J9 ~ u+ E* n ~& w8 d2 r( WDesk Reference and package insert should also put a
: W- P- t8 x8 w, G( Wwarning about the virilizing effect on a male or
. [' S& l, n, |1 s4 _* Tfemale child who might come in contact with some-
, c" w/ f" x& `5 F, D8 qone using any of these products.& l4 N7 c6 I, D7 l" k3 n' O
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4 M8 S% z# U( g0 p3 S1 }2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious
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3 r, h; G4 F* D& Q) FUnimed Pharmaceutical Inc. Montvale, NJ: Medical
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